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Analog Devices Inc. AD4684BCPZ-RL7
- Part No.:
- AD4684BCPZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD4684BCPZ-RL7.pdf
- Description:
- 1MSPS SINGLE ENDED DUAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,092
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Product details
Overview
AD4684BCPZ-RL7 from Analog Devices is a 16-bit, dual simultaneous sampling SAR ADC with 4 single-ended analog inputs (AINA0/AINA1/AINB0/AINB1), 1 MSPS throughput, and integrated 2.5 V reference (10 ppm/°C max). It features on-chip oversampling (OSR up to 8), resolution boost, and operates across −40°C to +125°C in motor control current sensing and position feedback systems.
For engineers reviewing the AD4684BCPZ-RL7 datasheet, AD4684BCPZ-RL7 pinout, AD4684BCPZ-RL7 application, or AD4684BCPZ-RL7 equivalent, key selection criteria include simultaneous dual-channel sampling accuracy (±1.5 LSB INL typ), SNR of 93 dB at OSR=8/VREF=2.5 V, channel-to-channel isolation (−109.7 dB), aperture jitter (20 ps), and LFCSP package compatibility with high-density industrial PCB layouts.
Technical Context
The AD4684BCPZ-RL7 integrates two independent SAR ADC cores sharing a 4-channel multiplexer and programmable sequencer, enabling true simultaneous sampling of two channel pairs (e.g., AINA0/AINA1 and AINB0/AINB1) with matched aperture delay (450 ps max). Its internal 2.5 V reference buffer supports external use via REFIO, while the separate VLOGIC supply (1.65–3.6 V) ensures compatibility with 1.8 V/2.5 V/3.3 V digital interfaces.
Oversampling is implemented via a configurable on-chip block that performs rolling average filtering, improving SNR by up to 5.5 dB and reducing effective SCLK speed requirements. The device uses charge redistribution capacitive DACs with 15 pF sampling capacitance and supports alert generation when conversion results exceed user-defined thresholds stored in ALERT_LOW_THRESHOLD/ALERT_HIGH_THRESHOLD registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit native; supports 18-bit output via resolution boost mode for enhanced dynamic range in low-bandwidth applications. |
| Throughput Rate | 1 MSPS for single-channel-pair mode; enables real-time capture of fast transients in motor phase current waveforms. |
| INL (typ) | ±1.5 LSB - ensures <0.0023% full-scale linearity error critical for closed-loop servo position accuracy. |
| SNR (typ) | 93 dB at OSR=8/VREF=2.5 V - delivers >15.2 ENOB for precision power quality monitoring at 100 kHz input. |
| Channel Isolation | −109.7 dB - prevents crosstalk-induced errors when sampling interleaved current and voltage signals in inverters. |
| Aperture Jitter | 20 ps - limits sampling uncertainty to <0.003% of 1 MSPS period, preserving signal integrity up to 5.3 MHz input bandwidth. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive motor control and industrial drive environments without derating. |
Pinout & Package
AD4684BCPZ-RL7 is housed in a 16-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD) requiring solder connection to PCB ground for thermal and electrical performance. Pin 1 and Pin 10 are dedicated GND references; REGCAP (Pin 3) and REFCAP (Pin 9) require 1 µF and 0.1 µF decoupling capacitors respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10) | Ground reference | Primary return path for analog and digital circuitry; must be connected to low-impedance system ground plane. |
| VLOGIC (Pin 2) | Digital interface supply | Independent 1.65–3.6 V rail enabling level-shifted SPI communication with mixed-voltage microcontrollers. |
| REGCAP (Pin 3) | Internal regulator decoupling | Stabilizes 1.9 V internal logic regulator; 1 µF capacitor minimizes noise coupling into digital core. |
| VCC (Pin 4) | Analog power supply | 3.0–3.6 V supply powering SAR core and reference; requires local 1 µF decoupling for PSRR optimization. |
| AINB1/AINB0 (Pins 5,6) | ADC B analog inputs | Single-ended inputs accepting 0–VREF; support simultaneous sampling with AINA0/AINA1 for dual-axis feedback. |
| AINA1/AINA0 (Pins 7,8) | ADC A analog inputs | Matched pair with AINB0/AINB1; aperture delay match ≤450 ps ensures sub-degree phase alignment in PMSM control. |
| REFCAP (Pin 9) | Reference decoupling | Filters 2.5 V bandgap reference; 0.1 µF capacitor required only when internal reference is enabled. |
| REFIO (Pin 11) | Reference I/O | Bidirectional pin: outputs buffered 2.5 V reference or accepts 2.5–3.3 V external reference (ADR4533 compatible). |
| CS (Pin 12) | Chip select | Active-low signal initiating conversion and framing SPI transfers; falling edge triggers acquisition timing (tQUIET = 10 ns). |
| SDOA (Pin 13) | Serial data output A | Provides ADC A or ADC B result or register readback; supports MSB-first straight binary format over standard SPI. |
| SDOB/ALERT (Pin 14) | Dual-function terminal | Outputs ADC B data OR asserts active-low ALERT when conversion exceeds programmed thresholds (configurable per channel). |
| SDI (Pin 15) | Serial data input | Writes CONFIGURATION1/2, ALERT, and threshold registers; supports full device configuration without external hardware. |
| SCLK (Pin 16) | Serial clock | Drives SPI interface; minimum 25 ns period (40 MHz max) supports high-throughput register access and data streaming. |
| EPAD | Exposed thermal pad | Must be soldered to PCB ground plane to achieve θJA = 55.4°C/W and ensure reliable operation at 125°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous sampling | Enables true time-aligned capture of two independent analog signals (e.g., motor phase A/B currents) without inter-channel skew. |
| On-chip oversampling (OSR) | Configurable OSR modes (up to 8) increase effective resolution and SNR while relaxing anti-alias filter requirements and SCLK speed. |
| Resolution boost function | Generates 18-bit output words from 16-bit core, delivering 9.55 µV LSB size (vs. 38.1 µV native) for ultra-fine current measurement quantization. |
| Alert function with thresholds | Hardware-level over/under-range detection eliminates host CPU polling; reduces latency to <200 ns from CS assertion to ALERT assertion. |
| Wide temperature range | Specified performance maintained from −40°C to +125°C enables deployment in engine compartments, industrial drives, and solar inverters. |
Applications
| Motor Control Current Sensing | Power Quality Monitoring |
|---|---|
|
Use Scenario: Real-time sampling of three-phase motor currents using shunt resistors in inverter leg drivers. IC Role / Device Role / Timing Role: Simultaneous dual-channel ADC capturing AINA0/AINA1 and AINB0/AINB1 at 1 MSPS to reconstruct instantaneous current vectors. Use Value: Aperture delay match ≤450 ps ensures <0.1° phase error between current channels, critical for field-oriented control (FOC) accuracy. |
Use Scenario: Continuous monitoring of voltage/current harmonics and THD in grid-tied inverters and UPS systems. IC Role / Device Role / Timing Role: High-SNR (93 dB) 16-bit conversion with oversampling enables 0.01% THD measurement resolution at 50/60 Hz fundamentals. Use Value: Channel-to-channel isolation of −109.7 dB prevents cross-coupling between voltage and current measurement paths, ensuring compliance with IEC 61000-4-30 Class A. |
| Erbium-Doped Fiber Amplifier (EDFA) | Inphase/Quadrature Demodulation |
|
Use Scenario: Closed-loop bias control of pump lasers and gain-flattening filters in optical telecom amplifiers. IC Role / Device Role / Timing Role: Precision DC monitoring of photodiode currents and thermistor voltages using internal 2.5 V reference (10 ppm/°C max drift). Use Value: Gain error match ±0.006%FS and offset error match ±0.12 mV enable stable gain calibration across temperature without recalibration cycles. |
Use Scenario: Baseband digitization of I/Q signals from RF demodulators in software-defined radios and radar receivers. IC Role / Device Role / Timing Role: Simultaneous sampling of I and Q analog paths with matched acquisition timing preserves phase coherence for complex envelope reconstruction. Use Value: 5.3 MHz input bandwidth (−0.1 dB) and 85.3 dB SNR at 100 kHz support >12-bit ENOB for wideband IF sampling up to 2.5 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel simultaneous sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD4685BCPZ-RL7 | 500 kSPS max throughput (vs. 1 MSPS); identical pinout, package, and feature set except reduced speed and lower power (6 mA vs. 8.5 mA IVCC). | Better suited for cost-sensitive, lower-bandwidth motor control where 500 kSPS suffices and thermal budget is constrained. | Select AD4685BCPZ-RL7 when system sampling rate requirements are ≤500 kSPS and power dissipation must stay below 22 mW. |
| AD7616BSTZ | 16-bit, 16-channel, simultaneous sampling; no internal reference; requires external 4.096 V ref; larger 64-lead LQFP package; 1 MSPS aggregate (not per channel). | Targets high-channel-count DAQ systems needing >4 inputs; lacks resolution boost and integrated alert function of AD4684BCPZ-RL7. | Choose AD7616BSTZ only when expanding beyond 4 channels is required and board space allows 10 mm × 10 mm LQFP footprint. |
Compared with AD4685BCPZ-RL7, AD4684BCPZ-RL7 delivers 2× higher throughput at marginally higher power, making it optimal for high-dynamic-response FOC. Versus AD7616BSTZ, AD4684BCPZ-RL7 offers superior integration (reference, alert, oversampling) in half the footprint-ideal for space-constrained motor drives.
Availability
AD4684BCPZ-RL7 is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and Erbium-doped fiber amplifier (EDFA) applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD4684BCPZ-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD4684BCPZ-RL7 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for high-speed, high-accuracy simultaneous sampling in demanding real-time control and measurement systems.
FAQ
What is the maximum sampling rate supported by the AD4684BCPZ-RL7?
The AD4684BCPZ-RL7 supports a maximum throughput rate of 1 MSPS in single-channel-pair mode (e.g., AINA0/AINA1 or AINB0/AINB1). In alternating channel mode (SEQ = 1), the rate drops to 500 kSPS. This 1 MSPS capability enables precise capture of fast transients in motor current waveforms and power system disturbances without aliasing.
Does the AD4684BCPZ-RL7 include an internal voltage reference?
Yes, the AD4684BCPZ-RL7 integrates a buffered 2.5 V internal reference with a maximum temperature coefficient of 10 ppm/°C and 7 µV rms noise. This reference is accessible via the REFIO pin and can be used directly for conversions or buffered externally (e.g., with ADA4807) for system-wide reference distribution.
How does the oversampling feature improve performance in the AD4684BCPZ-RL7?
The AD4684BCPZ-RL7's on-chip oversampling block performs rolling average filtering with configurable OSR values up to 8. At OSR = 8 and VREF = 2.5 V, SNR improves from 87.5 dB to 93 dB, increasing effective resolution to ~15.2 ENOB and relaxing anti-alias filter design constraints while reducing required SCLK frequency.
What is the purpose of the SDOB/ALERT pin on the AD4684BCPZ-RL7?
The SDOB/ALERT pin on the AD4684BCPZ-RL7 serves a dual role: it outputs ADC B conversion results during normal operation, or asserts an active-low ALERT signal when a conversion result exceeds user-configured thresholds stored in ALERT_LOW_THRESHOLD and ALERT_HIGH_THRESHOLD registers-enabling hardware-triggered fault response with <200 ns latency.
Is the AD4684BCPZ-RL7 compatible with 1.8 V digital interfaces?
Yes, the AD4684BCPZ-RL7 supports 1.8 V, 2.5 V, and 3.3 V digital interfaces via its dedicated VLOGIC supply pin (Pin 2), which accepts 1.65 V to 3.6 V. This allows direct connection to low-voltage microcontrollers and FPGAs without level-shifting circuitry, simplifying system design and reducing BOM count.
AD4684BCPZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Serial
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- 0:2
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-LFCSP (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD4684BCPZ-RL7 FAQ
1.How can I place an order for AD4684BCPZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD4684BCPZ-RL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD4684BCPZ-RL7 reliable?
The price and inventory of AD4684BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD4684BCPZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD4684BCPZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD4684BCPZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD4684BCPZ-RL7?
AD4684BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD4684BCPZ-RL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD4684BCPZ-RL7?
For technical support, including AD4684BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD4684BCPZ-RL7 requirements.
6.How does Aetrix verify that AD4684BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD4684BCPZ-RL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD4684BCPZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD4684BCPZ-RL7?
All AD4684BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD4684BCPZ-RL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD4684BCPZ-RL7 part is unused and in its original packaging.
Return procedure for AD4684BCPZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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